Abstract: The AEDI provides a national snapshot of young children’s health and development. In 2009, information was collected on 261,203 children who comprised 97.5% of the estimated Australian five-year-old population in their first year of full-time school. These data included information on 3,230 children who comprised 93.5% of the estimated NT five-year-old population. The AEDI provides information about how local children have developed by the time they start school across five domains of early childhood development: physical health and wellbeing, social competence, emotional maturity, language and cognitive skills (school-based), and communication skills and general knowledge. If a child’s score on a given domain is in the in the lowest 10% of scores nationally they are said to be ‘developmentally vulnerable’ on that domain. This report details the AEDI results for NT at the jurisdictional, regional and AEDI community levels. A further series of reports describing the results for specific local communities is expected to be available early in 2011. The AEDI findings provide a regional and community overview of how children are developing compared to other children in the NT and across Australia. Communities can use AEDI results to develop and evaluate their efforts to improve outcomes for children.